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P. B. DELANY. MEANS FOR AOTUATING AND CORRECTING THE VIBRATIONS 0FFORKS, REEDS, 6w.

Patented July 21, 1885,

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WITNESSES 2 INVENTOR N. PETERS, Pholo-Lflhognpher, Washington, D. c.

PATRICK B. DELANY, on NEW YORK,

MULTIPLEX TELEGRAPH COMPANY, OF SAME PLACE.

MEANS FOR ACTUATING AND CORRECTING PATENT OFFICE.

N. Y., ASSIGNOR TO THE STANDARD THE VIBRATIONS F FORKS, REEDS, do.

SPECIFICATION forming part of Letters Application filed April To allwhom it may concern.

Be it known that I, PATRICK B. DELANY, of New York city, State of NewYork, have invented certain new and useful Improvements in Devices forActuating and Correcting the Vibrations of Reeds, Forks, &c., of whichthe following is a specification.

In Various electrical apparatus in which vibrators are employed thesuccessful operation depends upon the proper adjustment or control ofthe normal rate of vibration. For instance, in several Letters Patent ofthe United States granted to me on the 9th October, 1883, I have shownsystems of electrical I 5 synchronous movements designed for telegraphicand other purposes in which I prefer to employ a vibrating fork or reed.In such patents the normal rate of vibration of the fork is shown ascontrolled by the adjustment of the pole-pieces of the vibrator-magnetlaterally with reference to the fork, so as to move the poles closer toor farther from the sides of the fork.

My present invention constitutes a novel and improved manner ofregulating the vibration of forks, reeds, &c.

In the accompanying drawings, Figure 1 is partly a diagram and partly aplan view of my improved organization. Fig. 2 is a side elevation of thesame. Fig. 3 is a detail view of a slightly-modified arrangement; Fig.4, a detail enlarged sectional View of the straps which hold the magnet,and Fig. 5 a detail View of the magnet-core.

A represents a section of a circular table on which insulated contactsare arranged. These contacts are traversed by a rotary circuitcompleter,A, which is connected with the main line. Some of the contacts upon thetable-say the 9s and 10s-are utilized for the reception of correctingimpulses of electricity to correct the speed of the vibrator.

For specific information as to this apparatus reference is made to mypatents, before mentioned. It will be sufficient at present merely toshow one contact (numbered 10 in the drawings) with which the branchcircuit a, which passes through the coil of the relay B to earth, isconnected. \Vhen a correcting 5o impulse is received from the line, itwill pass through the controlling circuit-eompleter A,

Patent No. 322,809, dated July 21,1885,

13, 1885. (No model.)

contact 10, and line a to the ground, thus en ergizing the relay B, asis presently fully described.

The circuit-completer A may be, as in my previous patents, rotated bymeans of a motormagnet, A arranged in proper relation to the teeth a ofa rotating armature-disk 011 the spindle of which the rotarycircuit-completer A is secured. The motormagnets are ener- 6o gized inthis instance by a main battery, MB, the circuit of which will presentlybe described. The vibrator (a fork, 0, being illustrated in thisinstance) is securely mounted in a post,

0, carried by a suitable base-board. A rod, D, is arranged between thetines of the fork and substantially parallel therewith. One end of therod passes loosely through a post, (I, located between the tines of thefork, and the other end is screw-threaded and passes through a post, (1.By means of a thumb-nut, (P, on the screw-threaded end of the rod, therod may be adjusted endwise, as is well understood. I preferably employa coil spring, (1", wound around the rod d and interposed between the 75 post (1 and the magnet E. This spring tends constantly to press themagnet, and with it the rod, inwardly between the tines of the fork, sothat when the nut d is unscrewed the magnet will move inwardly, and whenthe nut is screwed up it will be drawn outwardly. The magnet E, the coreof which is sufficiently short to permit its entrance between the tinesof the fork, is fixed on the rod D, as shown in the drawings. The coreof the magnet is prefer- 8 5 ably formed in three partsnamely, a centralportion, 0, Fig. 5, on which the coil is wound, and pole-pieces c c,which screw into the core, and are therefore capable of adjustment withreference to the tines of the fork. The helix of the magnet issurrounded by two insulated semicircular metal straps or bands, F, whichare secured together by flanges f, separated by some suitable insulatingmaterial, f.

The bolts f, which secure the flanges, are insulated from their socketsin the flanges, as is well understood.

I have spoken of the rod D as if it were a continuous rod passingthrough the magnet.

I prefer, however, the details of constructioi'l shown in Fig. 3, fromwhich it will be seen that the rod is composed of two sections, D D,

each of which has secured upon it one of the semicircular metal strapsF, so that when the straps are bolted around the helix of the magnet themagnet will be as firmly held,and may be adjusted as described, the sameas if the rod D were in one piece. I prefer this construction because noroom is wasted in the winding of the helix on the core, and it alsoaffords convenient means for connecting the circuits, as is presentlydescribed.

A pivoted insulated arm, G, is secured upon the bed-plate and carries alight metal coniact-finger, g, which projects upwardly and makes contactwith a platinum plate, 9, on the outer side of one of the tines of thefork. The contact is normally pressed toward the tine of the fork by aspring, 9 and the arm G may be adjusted against this spring by ascrew-bolt, G.

One pole of the main battery MB is connected with a metal post, 0, inwhich the fork is mounted. From thence the circuit passes through thetine of the fork, contacts 9 1/, arm G, and post (Z. A rubbingcontact-finger, D", on the post (1 bears upon the rod D, so that thecircuit continues through the rod D, coil of helix, and rod D to thepost d,and from thence by a wire, r, through the coils of themotormagnet A to the opposite pole of the battery MB. A resistance, It,is placed in a shunt circuit, .9, which is thrownaround the contacts 1 gto prevent sparking, as is well understood. A branch circuit (indicatedby t) extends from the post (I to the armature i of a magnet, T; thenceby the front contact of such armaturethrough an adjustable resistance,Rh, and wile i to the post (1, where it joins the main-circuit wire a.Normally,the armature of the relay B is against its back stop and thelocal of the magnet T is closed. The armature 1/ of said magnet istherefore drawn to its front stop, so that the branch or shunt circuit tt z? is normally closed. hen the fork is started into vibration, thecircuit of the battery MB will be opened and closed by the vibration ofthe fork at the contacts 9. These makes and breaks alternately cause themagnetization and demagnetization both of the motor-magnet A and of thevibrator-magnet E, so that the fork is continuously and automaticallyvibrated,and the armaturedisk and rotating circuit-eonipletercontinuously and automatically rotated. If, now,an impulse ofelectricity for correcting the speed of the vibrator be sent or receivedover the main line, the armature of the relay B will be drawn from itsback contact, the armature t of the magnet T will fall away from itsfront contact, and the shunt or branch circuit t t i will be opened. Themain fork-circuit will therefore take more current, the electromagneticeffect of the magnet E upon the tines of the fork will be increased, andthe fork will. vibrate more slowly. This impulse of correction is ofcourse but momentary, and when the traveling rotator leaves thecorrecting-contact 10 the parts are immediately restored to the normalcondition.

The resistance of the shunt-circuit [L I may be varied at the adjustableresistance R/z, so that the amouutof correction can beadjusted.

In my patent No. 286,281 of October 9, 1888, I have shown an arrangementfor correcting the vibrator by shunting a resistance in the mainfork-circuit in or out for the purpose of correcting a vibrating fork,and in an application for Letters Patent filed by me February 28, 1884-,serially numbered 122,054, I have shown a similar arrangement, and alsoa plan by which the direct fork-circuit is momentarily interrupted tocorrect the speed of the vibrator. In the present instance it will beperceived that I change the current or vary the electromagnetic power ofthe direct fork-circuit by opening a branch or shunt, which normallytakes part of the current. Obviously, the same results could be attainedby permitting the brancht t If to be normally open, and close it uponthe reception or transmission of the correcting impulse. In that eventpart of the current in the direct circuit would be shunted around thefork, the electro-magnetic power ofthe magnet E weakened, and the forkwould consequently vibrate more rapidly. In either event the current inthe coils of the motor-magnets will remain practically unchanged.

Some means is practically always necessary in this or other apparatus ofsimilar character to adjust the normal rate of vibration of the fork. Byscrewing the polepicces e in or out they may be adjusted in the desiredrelation to the tines of the fork, so as to regulate the rate ofvibration. The fork is further controlled in this regard by adjustingthe vibrator-magnet in a direction parallel, orsubstair tially so, withthe vibrator or tine of the fork.

Obviously, by causing the magnet E to move in or out between the tinesof the fork the relation of the magnet to the tines will be va ried, andcorrespondingly affect their rate of vibration. For instance, with themagnetpoles just entered between the tines of the fork-or, in otherwords, considering the action with reference to one tine of the fork ora vibrating reedwhen the pole of the magnet is moved toward and parallelwith the vibrator, so as to bring it opposite the side of the vibrator,the magnetic field acting on the vi brator is increased and the rate ofvibration is retarded,whereas when the pole of the mag-v net is movedoutwardly, when it commences to pass from between the ends of the t'orkor, in other words, when less of its field is caused to act on thevibrator-the rate-isaceelerated.

So far as I am aware the only manner of changing the relation of thepoles of the vibrator-magnet to an automatically and continuously actingvibrator has been by adjusting the poles nearer to or farther from thevibrator.

IIO

I am not aware that it has even before been proposed to effect a changein the normal rate of vibration of such devices by adjusting thevibrator-magnet in a plane parallel, or substantially so, with thelongitudinal axis of the vibrator.

The arrangement has many advantages. A

-very much more delicate efiect may be produced upon the vibrator thanwith the use of a fine micrometer-screw for approaching the poles towardor withdrawing them from the vibrator in the ordinary manner. Of courseI may use in my present plan a fine micrometer-screw, as is wellunderstood. By imagining the idle tine of the fork, or the one whichdoes not carry the contact 9, to be removed all the'conditions attendingthe use of a vibrating reed will exist. Instead of leaving the idle tineof the fork to vibrate, one pole of the magnet E may be placed insliding contact with that tine, as clearly illustrated in Fig. 4.

I do not limit myself to the specific details of construction andarrangement, though the particular structure shown possesses advantages. For instance, in the particular construction of magnet the smallamount of iron in the core and the capacity of the pole-pieces e foradjustment are desirable.

I claim as my invention- 1. The combination of a continuously automatically-acting circuit-interrupting vibrator, a vibrator-magnet, andmeans for adjusting the pole of the magnetin the direction of the lengthof the vibrator to change the normal rate.

2. The combination of the vibrator, a vibrator-magnet, thelaterally-adjustable polepiece of said magnet, which may be adjustedlaterally toward or from the vibrator, and means for adjusting the poleof the magnet in the direction of the length of the vibrator.

circuit-interrupting vibrator, the vibratormagnet, its fixed core, andthe adjustable polepiece of the magnet, which may be adjusted toward orfrom the vibrator in a line coincident with the axis of themagnet,whereby the normal rate of the vibrator may be regulated.

6. The combination of the vibrator, the vibrator-magnet, the battery andcircuit of the vibrator-magnet, a branch or shunt circuit around thevibrator-magnet, a resistance in said shunt, and means for controllingthe shunt to correct the speed of the vibrator.

7. The combination of the rotating disk and circuit-completer, the tableof contacts, the motor-magnet, its circuit, an automatic circuit breakeror vibrator for interrupting the motor-circuit, its magnet, itscircuit,and shunt around the magnet, and means for controlling saidshunt, for the purpose set forth.

In testimony whereof I have hereunto subscribed my name.

PATRICK B. DELANY.

Witnesses:

WENDELL Goonwm, R. G. BROWN.

